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\bibitem{Ball_etal1994} Ball, A., Des Jarlais, D. C., Donoghoe, M. C., Friedman, S. R., Goldberg, D., Hunter, G. M., et al. (1994). \textit{Programme on substance abuse : multi-city study on drug Injecting and risk of HIV infection : a report prepared on behalf of the WHO international collaborative group (Chapter 1-2)}. Geneva: World Health Organization (WHO).

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